PT-2026-38930 · Linux · Linux Kernel

Published 2026-05-08 · Updated 2026-05-15 · CVE-2026-43288

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A panic occurs in the ext4 file system when the DOUBLE CHECK macro is defined. During the execution of mb group bb bitmap alloc(), the system reads and validates the block bitmap. If validation fails, the ext4 mark group bitmap corrupted() function attempts to update the sbi->s freeclusters counter variable. Because ext4 percpu param init() is called after ext4 mb init(), the per-CPU counter is not yet initialized, leading to a page fault and system crash.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Use of Uninitialized Resource

Weakness Enumeration

CWE-908

Related Identifiers

CVE-2026-43288

Affected Products

Linux Kernel

References · 16

• https://git.kernel.org/stable/c/bf5b609524497c195f801cd5707252384aed8149 · Patch
• https://cve.org/CVERecord?id=CVE-2026-43288 · Security Note
• https://git.kernel.org/stable/c/0d5fcb063cdabb9aeaa8554b7fedad2092c4150e · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-43288 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43288 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43288 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-43288 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-43288 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-43288 · Vendor Advisory
• https://git.kernel.org/stable/c/270564513489d98b721a1e4a10017978d5213bff · Patch
• https://git.kernel.org/stable/c/aec095f3cc6cf209effd93278ce35be27db81d73 · Patch
• https://git.kernel.org/stable/c/9e9fb259bcddf459a0168f4a964e979e500a68a5 · Patch
• https://twitter.com/CVEnew/status/2053174659172942291 · Twitter Post
• https://git.kernel.org/linus/270564513489d98b721a1e4a10017978d5213bff · Note
• https://docs.bell-sw.com/security/cves/CVE-2026-43288 · Note